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90=50+2x-4
We move all terms to the left:
90-(50+2x-4)=0
We add all the numbers together, and all the variables
-(2x+46)+90=0
We get rid of parentheses
-2x-46+90=0
We add all the numbers together, and all the variables
-2x+44=0
We move all terms containing x to the left, all other terms to the right
-2x=-44
x=-44/-2
x=+22
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